Topological Defect Engineering on Carbon Electrode for Advanced Batteries
| Project/Area Number |
22K14757
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 36020:Energy-related chemistry
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
YU WEI 東北大学, 材料科学高等研究所, 特任助教 (10900904)
|
|---|
| Project Period (FY) |
2022-04-01 – 2024-03-31
|
| Project Status |
Granted (Fiscal Year 2022)
|
| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2022: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
|
|---|
| Keywords | Topological Defect / Carbon Material / Lithium-Oxygen Battery / Lithium-Gas Battery |
|---|
| Outline of Research at the Start |
By using three-dimensional single-layer graphene frameworks equipped with designed topological defects, the catalysis of topological defects, which are non-hexagonal carbon rings, is investigated through experiments and theoretical calculations to improve the cycle stability of Li-gas batteries.
|
| Outline of Annual Research Achievements |
Content: Topological-defect-rich and edge-site-free graphene mesosponge (GMS) was successfully synthesized by chemical vapor deposition. The properties of GMS were characterized by X-ray diffraction, nitrogen adsorption-desorption, Raman spectroscopy, and temperature-programmed desorption. Lithium-oxygen battery performance was evaluated using cyclic voltammetry and discharge-charge tests. The discharge-charge mechanism was investigated by quantitative and qualitative methods. Importance: for the first time, we confirmed the abundant existence of topological defects on GMS through comprehensive characterizations. Moreover, the catalytic effect of topological defects in Li-O2 batteries was estimated without the influence of edge sites, which was not achieved in previous reports.
|
| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
In previous plan, I need to focus on the synthesis of the carbon material and the textural characterizations in the first year. So far, the synthesis of GMS has already been completed. By carefully selecting the fabrication conditions, a better understanding of how the synthesis conditions affect the final structure of the carbon materials is achieved. The electrochemical performance provides a clear direction for the selection of good carbon materials for Li-O2 batteries. I also completed part of the second year plan. The battery based on GMS cathode was assembled and the performance was compared with commercial carbon references. Also, construction of an in situ DEMS system to study the reaction mechanism was completed. Preliminary tests confirmed the stability of the system.
|
| Strategy for Future Research Activity |
In the following work, I will perform comprehensive characterizations on Li-O2 batteries based on GMS cathodes, including the study of electrochemical cycle stability and reaction mechanism. Free-standing GMS-sheet without organic/inorganic binders will be synthesized for practical Li-O2 batteries with high energy density and long cycle stability. The development of advanced isotope DEMS technique to distinguish the side reaction of cathode and electrolyte is the key to deepen the understanding of the reaction mechanism. I plan to publish several papers presenting our results on rational design of carbon cathodes for advanced batteries.
|
Report
(1 results)
Research Products
(7 results)
